HyperDic English OPTIC ... optical glass

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English 1 sense of the expression *optical glass*:
NOUN	substance	optical glass	clear homogeneous glass of known refractive index

Englishoptical glass: 1 sense noun 1, substance
Meaning	Clear homogeneous glass of known refractive index; used to make lenses.
Narrower	optical crown, crown glass, optical crown glass	optical glass of low dispersion and low refractive index
Narrower	optical flint, flint glass	optical glass of high dispersion and high refractive index
Broader	glass	A brittle / brittle transparent solid with irregular atomic structure

HyperDicEnglishOPTIC ... optical glass